ZOOKEEPER-4649: Upgrade netty to 4.1.86 because of CVE-2022-41915

Yesterday a new netty version was released fixing CVE-2022-41915
See https://nvd.nist.gov/vuln/detail/CVE-2022-41915
We need to upgrade the netty version.

Author: Mate Szalay-Beko <symat@apache.com>

Reviewers: Chris Nauroth <cnauroth@apache.org>

Closes #1964 from symat/ZOOKEEPER-4649-branch-3.6

pom.xml

@@ -355,7 +355,7 @@
     <mockito.version>2.27.0</mockito.version>
     <hamcrest.version>1.3</hamcrest.version>
     <commons-cli.version>1.4</commons-cli.version>
-    <netty.version>4.1.85.Final</netty.version>
+    <netty.version>4.1.86.Final</netty.version>
     <jetty.version>9.4.49.v20220914</jetty.version>
     <jackson.version>2.13.4.2</jackson.version>
     <json.version>1.1.1</json.version>